近年來，全球暖化所造成的極端氣候出現的頻率越來越高，長延時且高強度的降雨事件更是一年多過一年，極端降雨事件使得土砂相關災害每年都對台灣造成大量的損失。如何有效且準確的監測土砂的運移，將會是在治理及預防土砂相關災害時非常重要的一環。
目前台灣政府在計算或推估輸砂量時，主要使用兩種方式，一是使用經驗公式；二是使用樣本法。但此兩種方法均有不足，其中，經驗公式的結果極為容易高估輸砂量，採取水樣又會因為天氣因素導致人員的風險，因此如何準確的、非直接的取得泥沙監測的數據就成為一個值得研究的問題。
為了估算底床載輸沙率，本研究使用日本管式水聲計進行量測。通過實驗和統計方法確定音壓與動量之間的關係以及平均水流速度與粒子速度之間的關係。並利用此關係建立了一種估算泥砂質量的方式。

In recent years, the frequency of extreme weather under global warming has become higher and higher. Long-duration and high-intensity rainfall events occur more frequently.Environmental factors, such as steep terrain, high speed of river flow, fragile geology and extreme rainfall, have made sediment related disasters commonly and caused a lot of losses and casualties in Taiwan. Therefor, how to effectively and accurately monitor the movement of sediment will be a very important part in the management and prevention of sediment-related disasters.
At present, the Taiwan government mainly used two methods to estimate the sediment transport rate. One is that the sediment transport rate is estimated by using an empirical formula; the other is that the sediment transport rate is estimated by samples from the river-bed. But these methods are inadequate. The results of the empirical formula are easy to overestimate the rate of sediment transport, and the sampling work is high risk for staff due to severe weather. Therefore, a new monitoring method to indirectly obtain the data of sediment becomes a worth study.
In order to estimate the bed-load transport rate, the study used a Japanese pipe hydrophone to measure. The relationship between sound pressure and momentum and the relationship between average water flow velocity and particle velocity are determined experimentally and statistically. And using this relationship, a method for estimating the quality of sediment has been established in this study.

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